Question 867045
The constant but unknown variable, w, is the distance described as , "The edges of the pool area are to be the same distance from the edges of the tract."  That is for the non-pool area.


Area of land tract plus pool:  {{{40*46}}}.
Area of base of pool:  {{{(40-2w)(46-2w)}}}.
A ratio of areas is given, pool/LandTract:  {{{highlight_green((40-2w)(46-2w)/(40*46)=0.6)}}}


PROCESS:
(1)  Find the value of w.
(2)  Use w to find the dimensions, (40-2w) and (46-2w).



Nothing more on this solution post unless you find the process does not work or you find trouble within it.
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Further explanation will help.
According to the problem description, the area (40-2w)(46-2w)  is  60% of the area 40*46.  The green highlighted equation comes from this description.  First goal then, is to solve for w from that equation.